package org.chapter.Util;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;


/**
 * Created by Mr.no.
 * User:yangyun
 * Date:2017/9/24
 * Time:23:50
 */

/**
 * 属性文件工具类
 */
public final class PropsUtil {
    private static final Logger LOGGER = LoggerFactory.getLogger(PropsUtil.class);

    /**
     * 加载属性文件
     * @param fileName
     * @return
     * @throws FileNotFoundException
     */
    public static Properties loadProps(String fileName) throws FileNotFoundException {
        Properties props = null;
        InputStream is = null;
        //得到当前项目的根路径下的文件
        is = Thread.currentThread().getContextClassLoader().getResourceAsStream(fileName);
        if (is == null) {
            throw new FileNotFoundException(fileName + "file not found");
        }
        props = new Properties();
        try {
            props.load(is);
        } catch (IOException e) {
            LOGGER.error("load properties file failure", e);
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                   LOGGER.error("close input stream failure ",e);
                }

            }
        }
        return props;
    }

    /**
     * 获取字符属性(默认值为空字符串)
     * @param props
     * @param key
     * @return
     */
    public static String getString(Properties props,String key){
        return getString(props,key,"");
    }

    /**
     * 获取字符属性（可指定默认值）
     * @param props
     * @param key
     * @param defaultValue
     * @return
     */
    public static String getString(Properties props,String key,String defaultValue){
        String value = defaultValue;
        if (props.contains(key)){
            value = props.getProperty(key);
        }
        return value;
    }

    /**
     * 获取数值型属性（默认值为0）
     * @param props
     * @param key
     * @return
     */
    public static int getInt(Properties props,String key){
     return  getInt(props,key,0);
    }

    /**
     * 获取数值型属性（可指定默认值）
     * @param props
     * @param key
     * @param defaultValue
     * @return
     */
    public static int getInt(Properties props,String key,int defaultValue){
        int value = defaultValue;
        if (props.containsKey(key)){
            value = CastUtil.castInt(props.getProperty(key));
        }
        return value;
    }
    /**
     * 获取布尔型属性（默认值为 false）
     */
    public static boolean getBoolean(Properties props, String key) {
        return getBoolean(props, key, false);
    }

    /**
     * 获取布尔型属性（可指定默认值）
     */
    public static boolean getBoolean(Properties props, String key, boolean defaultValue) {
        boolean value = defaultValue;
        if (props.containsKey(key)) {
            value = CastUtil.castBoolean(props.getProperty(key));
        }
        return value;
    }
}
